[Mailman-Users] NAT translation problems?

[Drew Krause]

Hello, a few subscribers with city and county government email addresses 
are complaining that our list mail is not getting to them. A peek at our 
mail logs confirms this. One of their system administrators noted that 
their server makes use of 'NAT translation', a concept new to me.

Has anyone else had this problem? (Is it indeed a mailman issue?) Are 
there any settings or workarounds to solve this?

Any help appreciated!